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[Q] Carrier (AT&T) Unlock Code Unsuccessful

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http://forum.xda-developers.com – I received an unlock code from AT&T for my One XL. The unlock code comes up as unsuccessful. I followed the unlock instructions exactly. And I've called back and verified that AT&T has the correct IMEI and double checked the unlock code. I've never had an issue unlocking a phone before. I contacted HTC. They tell me to contact AT&T, as "they're the ones who have the unlock codes." AT&T tells me to contact HTC. Would running CM 10 have any effect on my attempt to enter the carrier unlock? (HowTos)